Wltnesses



(No Model.)

K. H. c. PRESTON.

MACHINE FOR GRINDING MOWER AND HARVESTER KNIVES.

No. 257,893. Patent'edMay 16, 1882.

FIE-E- f I UNITED- STATES PATENT 7 OFFICE. I

,KlNG H. o. rnnsrornorEMANLIUs-NEW YORK.

.IYI'AQHINE FoR GRlNDlNG MOWER AND HAR'VESTER'KANIVES.

SPECIFICATION forming part of Letters Patent No. 257,893, dated May 16, 1882.

' l V Application filed October {18, 1881. (No model.)

To all whom it may concern:

Beit known that I, KING H.C. PRESTON, of Manlius, in. the county of Onondaga, in the State'ot' New York, have invented new and useful Improvements in Machines for Grinding Mower and Harvester Knives, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to an improved maehineforgrindingmowerandharvester knives,

- organized so as to be adjustable in all its movemerits, and thus rendered more convenient and efficient in its operation; and it consists essentially of a driving-wheel journaled at a fixed point on a stationary pedestal or standard, a grinding-wheel and its shaft hung in a frame supported bya vibratory arm, a pinion or suitablc gear connected to the shaft of the grindingwheel and actuated by the drivingwheel, and an oscillating lever fulcrumed on the pedestal and actuated by the driving-wheel, and engaging with its freeend the frame which carries the grinding-wheel, thereby imparting to the said frame the requisite oscillating motion for movingthe grinding-wheel back and forth over the knives to be ground simultaneously with the rotation of said grinding-wheel.

The invention also consists in certain peculiaritiesin the details of the aforesaid machine, all as hereinafter more fully explained, and specifically set forth in the claims.

In the annexed drawings, Figure l is a front elevation of my invention; Fig. 2, a side view of the same, taken back of line yy; Fig. 3, a rear View, and Fig. 4 a plan view.

Similar letters of reference indicate eorre-. sponding parts.

S represents a pedestal or standard rising from a bed-plate, m, by means of which it is rigidly secured to a suitable support. At a fixed point across the top of the standard S is attached an arbor, a, which projects at opposite sides of the standard,and has at the front of the latter the driving-wheel or spur-wheel A journaled on it. On the rear end of the arbor is hung the vibratory pendent arm B, the lower extremity of which has a horizontal extension, O, reaching across the periphery of the driving-wheel A.

To the rear end of the extension O, or near its junction with the arm B, is swiveled and a ustably connected :1. bar, h, which is allowed 5 On the bar his hinged a frame, t, having the axis of the bolt a, or pivotof the bar h. The grinding-wheel G is journaled on the frame 2', parallel to the axis of the hinge thereof. By

axis of its connection at right angles to the the adjustment of the bar It the axis of the while the hinged connection ofthe frame i with the bar h allows the grinding-wheel to freely rise and fall. The axle of the grinding,-

grinding-wheel G can be set at various angles,

wheel is extended to the front end of the ex tension 0 and journaled thereon, and its intermediate portion is made flexible by universal joints ll, or by joints of said axle coupled by pivotal pins arranged at right angles to each.

other. The front end of the axle ofthe grinding-wheel is provided with a pinion, b, which engages with the drivingwheel A and transinits rotary motion to the grinding-wheel...

c is an eccentric attached to the drivingwheel, and d is an eccentric rod or leverconnectcd with said eccentric. The free end-of the said lever d is provided on itsfront face with two parallel ribs or bearings, cc, which engage with opposite sides of a lug,f, on the arm-extension O. The lever d works on a fulcrum, g, connected to the standard S. Thus by turning the driving-wheel A the eccentric c is caused to impart to the lever d an oscillating motion as well as a reciprocating motion.

' The oscillation of the lever cl is transmitted to the arm-extension O, and thereby carries the grinding-wheel back and forth over the edge of the knife to be ground. The extent of the aforesaid motion is made adjustable by providin g the hack of the eccentric rod or lever d with a longitudinal slot, 1, which occupies only a part of the thickness of the lever d, and is widened at the inside thereof to receive the head of a bolt which slides in said slot and constitutes the adjustable fulcrum g of said lever. The shank of said bolt is screwthreaded, and passes through a vertical slot, 8, in the standard S, and is retained at the desired position by means of aclamping-nut, o. The aforesaid slots r and 8. allow, the fulcrum g to be set at a greater or less distance from the end of the lever d, and thus increase or diminish the oscillation of the leverd and the arm-extension O, which carries the grindingwheel. The slots of the standard is of sufficient length to allow the fulcrum to be set directly opposite the point of connection between the lever d and lag f on the arm-extension O, and thus completely stops the oscillation of said parts. This permits the grinding-wheel to be maintained over one point on the knife when required to grind out deep nicks'therein. By lateral extensions of the slot 3 at the lastmentioned point the fulcrum can be set so as to hold the grinding-wheel at any desired point on the knife to be ground. The knife is held in position on the bed m by means of aclamp,

10, which is connected with said bed and presses upon the top of the knife, and awedge shaped plate, t, which bears against the back of the knife, and is held adjustably in its position by a set-screw, 1, passing through a slot, 2,.in said plate. 7

When the machine is not in operation the grinding-wheel is supported bya wire, 3, which is connected to the framed, and suspended from the end of the arbor a, to which latter it is adjustably connected by means of a plate, 4, on the end of the wire, said plate having slots which engage a stud-pin on the arbor a, and are so arranged as to hold the wire and the frame at a greater or less elevation from the end of the machine- Havingdescribed my invention, what I claim as new, and desire to secure by Letters Patent, 1S-.-

'1. A machine for grinding mower and harvester knives, consisting'ot' a driving-wheel journaled ata fixed point on a stationary standard, a grinding-wheel hung in a vibratory frame, a suitable gear connected to the shaft of the grinding-wheel and actuated directly by the driving-wheel, an eccentric connected 4 to the driving-wheel, and an oscillating lever having an adjustable fulcrumon the standard and actuated by the aforesaid eccentric, and engaging with its free end the frame which carries the grinding-wheel, all as described and shown.

2. In combination with the standard S, the arbor at, having connected to it the drivingwheel A and vibratory arm B, said arm having at its free end the horizontal extension 0, and supporting thereby the grinding-wheel G and the shaft thereof, the pinion b on said shaft, the eccentric c, fixed to the driving-wheel, and the eccentric rod orlever d, fulcrumed on the standard S, and having at its free end the elongated bearin gs e e, engaging the lug f on the arm-ex tension O,substantiallyasdescribedandshown.

3. In combination with the vibratory arm B, supporting at its free end the grinding-wheel and its axle, and the driving-wheel A, provided with the eccentric c, the eccentric-rod d, engag ing with its free end the support of the grinding-wheel, and provided with the slot 1', the standard S, provided with the slot 8, and the fulcrum g, havingascrew-threaded shank passing through the slot of the standard, and provided with the clamping-nut 12, substantially in the manner set forth and shown.

\ 4. The combination, with the grinding-wheel Gr, journaled on a frame which is connected KING H. O. PRESTON. [L.

Witnesses (1 H. DUELL, WM. (3. RAYMOND. 

